Rails3: scm: darcs: fix error of test_destroy_valid_repository at functional test
On Rails 3.1, ActiveRecord::HasManyThroughCantAssociateThroughHasOneOrManyReflection error raises. For more details, see r7062.
Rails3: scm: darcs: fix error of test_diff at functional test
Rails3: scm: darcs: fix error of test_changes at functional test
Rails3: scm: darcs: fix error of test_browse_at_given_revision at functional test
Rails3: scm: darcs: fix error of test_browse_directory at functional test
Rails3: scm: subversion: fix error of test_format_identifier at unit model test
Rails3: scm: subversion: fix error of test_find_changeset_by_empty_name at unit model test
Rails3: scm: subversion: fix error of test_identifier at unit model test
Rails3: scm: subversion: fix error of test_directory_listing_with_square_brackets_in_base at unit model test
Rails3: scm: subversion: fix error of test_directory_listing_with_square_brackets_in_path at unit model test